KT-21698 Create interface shouldn't suggest to declare it inside a class which implements it

idea/testData/quickfix/createFromUsage/createClass/delegationSpecifier/traitDelegatorToSuperclass2.kt

@@ -0,0 +1,7 @@
+// "Create interface 'A'" "true"
+package p
+
+// TARGET_PARENT:
+class Foo: <caret>A {
+
+}

idea/testData/quickfix/createFromUsage/createClass/delegationSpecifier/traitDelegatorToSuperclass2.kt.after

@@ -0,0 +1,11 @@
+// "Create interface 'A'" "true"
+package p
+
+// TARGET_PARENT:
+class Foo: A {
+
+}
+
+interface A {
+
+}